1891.] THE 'challenger' EXPEDITION. 439 



8. Pleurotoma (Drillia) crossei. (Plate XXXIV. fig. 8.) 



Testa parva, hreviter fitsiformis, alhida ; anfrad. 7, suprermis 

 Icevis, convexus, cceteri superne leviter concavi, rotunde angulati, 

 infra angtdum arcuatim contracti, costis obliquis teimibus 

 circiter 15 {in anfr. idt. inferne attenuatis) instructi, line- 

 isque elevatis paucis parum cotispicuis infra angulum ornati ; 

 anfr. idt. inferne valde contractus j apertwa- parva, longit. totius 

 i- adcequans ; labrum supra angulum Jiaudprofunde sinuatum. 

 Longit. 10 rnillim., diani. 3|; apertura 4 longa, 2 lata. 

 This species lias the whorls much contracted at the lower 

 part and prominent at the rounded angle. The riblets are ohHque 

 below, and flexuous in the concavity. The spiral lirse are more 

 conspicuous around the lower part of the bodj-whorl than elsewhere, 

 and altogether absent in the concavity below the sutural line. 



9. Pleurotoma (Drillia) hoylei. (Plate XXXIV. fig. 9.) 



Testa parva, hreviter fusiformis, cdhida ; anfract. 8, superne 

 oblique concavi, in medio obtuse angulati, infra angulum 

 contracti, via; convexiusculi, costis oblique jiexuosis, prcecipjue ad 

 angidum {supra et infra mox evanidis) instructi, striisque 

 incrementi tenuissimis sculpti; ajjertura parva, longit. totius ^ 

 paulo superans ; sinus labri mediocriter profundus, in con- 

 cavitate situs. 

 Longit. 9 millim., diam. 3| ; apertura 3| longa, Ig lata. 

 The costse in this species are very short, and soon become obsolete 

 above and below the angle, so that they appear like a series of 

 oblique nodules. The absence of spiral sculpture is peculiar. 



10. Pleurotoma (Drillia) watsoni. (Plate XXXIV. fig. 10.) 



Testa parva, breviter fusiformis, alba ; anfr. 6, supremi duo 

 {micleus) Iteves, convexi, cceteri superne oblique declives, dein 

 angulati, infra angidum plani, costis tenuissimis obliquis 

 circiter 20 lirisque spiralihus {in anfr. superior ibus duo, in 

 ultimo circiter 14) nodose cancellati, supra angulum liris spirali- 

 hus paucis subobsoletis cincti ; anfr. ult. infra medium valde 

 contractus ; sinus mediocriter profundus ; labrum arcuatum, 

 prominens. 

 Longit. 6j million., diam. 3^ / apertura 2-3- longa, 1^ lata. 

 This shell has a large smooth apex ; the upper slope of the whorls 

 is comparatively smooth, exhibiting only a few (about 4) faint 

 spiral lirse, and the lower portion and the greater part of the body- 

 whorl are covered with a distinct cancellation, the points of inter- 

 section of the oblique and transverse lirae being rather acutely 

 nodulose. 



11. Cancellaria exigua. (Plate XXXIV. fig. 11.) 



Testa minima, elongata, ovata, alba ; anfract. 4-5, supremux 

 {nucleus) magnus, Icevis, globosus, cceteri convexi, circa medium 

 liris duobus spiralihus cincti, costis obliquis tenuihus circiter 12 



